Composite shield structure of PMR writer for high track density
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United States of America Patent
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Sep 28, 2010
Grant Date -
Nov 6, 2008
app pub date -
Apr 13, 2007
filing date -
Apr 13, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
Improved writability and a substantial reduction in adjacent track erasure are achieved by incorporating a composite shield structure in a PMR writer. There is a trailing shield formed a certain distance above the top surface of a write pole, a leading shield formed a certain distance below the bottom surface of the write pole, and a partial side shield having a section formed on each side of the write pole. The partial side shield thickness is less than that of the write pole. Each partial side shield section has a side that is parallel to the nearest write pole side and a top surface that is offset from the write pole top surface by 0 to 0.15 microns. A plurality of magnetic connections between two or more shield elements is employed to ensure correct magnetic potential. The large write pole has a flare angle of 45 to 75 degrees.
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